EP0032117A2 - Appareil de détection de trous ou défauts sur des surfaces - Google Patents
Appareil de détection de trous ou défauts sur des surfaces Download PDFInfo
- Publication number
- EP0032117A2 EP0032117A2 EP81100044A EP81100044A EP0032117A2 EP 0032117 A2 EP0032117 A2 EP 0032117A2 EP 81100044 A EP81100044 A EP 81100044A EP 81100044 A EP81100044 A EP 81100044A EP 0032117 A2 EP0032117 A2 EP 0032117A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- rows
- mirrors
- monitoring apparatus
- accordance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
Definitions
- the present invention relates to monitoring apparatus and has particular reference to combined optical and electronic monitoring apparatus for detecting holes or surface defects in webs or other light reflecting surfaces.
- the principal object underlying the present invention is to provide monitoring apparatus which is particularly compact and which can be readily manufactured. It is a further object of the present invention to provide an improved apparatus for detecting light remitted from the surface of a moving web of material.
- the present invention envisages monitoring apparatus, in particular for monitoring for holes or surface defects in webs or other light reflecting surfaces, the apparatus comprising a light transmitting device including a laser light source for projecting a light curtain towards a surface under investigation; light receiving means for receiving light from said light curtain, after said light curtain has fallen on said surface, and for directing this light to photoelectric detection means and an electronic processing circuit for evaluating signals from said photoelectric detection means to signify the presence and/or nature of a defect in said surface; said light transmitting device comprising a plurality of inclined strip-like dividing mirrors arranged one behind the other in first and second rows in an alternating sequence, with the end regions of adjacent dividing mirrors of the sequence overlapping in the direction of the rows, and means for scanning light from said laser light source to form first and second scanning light beams which are incident on respective ones of said rows in the directions of these rows and which are deflected through substantially 90° by said dividing mirrors to form said light curtain; said light receiving means comprising a plurality of light gathering devices associated
- This arrangement is particularly compact because all the components can be located in a common housing on one side of the web.
- the use of a plurality of inclined strip-like dividing mirrors arranged one behind the other in first and second rows in an alternating sequence with the end regions of adjacent dividing mirrors of the sequence overlapping in the direction of the rows enables a very broad light curtain to be generated without gaps.
- the depth of the housing containing the monitoring apparatus can be kept relatively small for a given width of the scanning light curtain simply by increasing the number of strip-like dividing mirrors.
- the light gathering devices can readily be arranged closely adjacent the first and second rows of dividing mirrors so that the overall width of the housing can also be kept relatively small.
- a cylindrical lens common to both the first and second rows of dividing mirrors and the first and second rows of light gathering devices extends between said rows and said surface under investigation with the focal line of said cylindrical lens lying on said surface.
- a single cylindrical lens is thus advantageously used for both the light beams transmitted towards the surface under investigation from the first and second rows of strip-like dividing mirrors and for the light remitted from the surface under investigation to the light gathering devices.
- the monitoring apparatus can also be used with advantage in an arrangement in which the surface under investigation takes the form of a web guided over the surface of a drum the axis of which lies parallel to the rows of dividing mirrors and light gathering devices and in the plane of symmetry of the apparatus.
- the radius of the drum should preferably be chosen so that the transmitted light beams, following reflection at the angular of specular reflection on the surface of the drum,impinge centrally on the associated light gathering devices. In this way it is possible to ensure that specular reflection occurs into both the first and second rows of light gathering device which are spaced apart to either side of the central plane of symmetry.
- An especially preferred light transmitter which is compactly arranged and of simple construction, features an arrangement in which a light beam from said laser light source is split into first and second light beams via a beam divider and a deflecting mirror arranged parallel thereto,with said first and second light beams converging on a mirror wheel arranged symmetrically at the focal point of two strip-like concave mirrors which are aligned with said first and second rows of dividing mirrors whereby said first and second scanning light beams are generated in the image spaces of said strip-like concave mirrors.
- the individual dividing mirrors of the first and second rows are transversely spaced apart from one another.
- This arrangement brings particular constructional advantages without disadvantageously affecting the optical quality of the apparatus.
- the transverse spacing between the individual mirrors advantageously amounts to approximately twice their width.
- a particularly preferred embodiment which is primarily intended for monitoring for holes : makes use of light gathering devices in the form of first and second rows of light conducting rods which replace the strip-like Fresnel lenses and which each carry a photoelectric converter at at least one end face. All the photoelectric converters are once again preferably connected to a common electronic processing circuit.
- the present invention makes use of numerous small light conducting rods which are arranged in first and second rows and displaced in the longitudinal direction in order to obtain a continuous scanning range without gaps.
- the light conducting rods preferably overlap in the longitudinal direction by an amount in the range from 2 to 30 %,and particularly by 15 %,of their lengths. I.e. the amount of overlap of one light conducting rod on the next adjacent conducting rod lies in the aforementioned range.
- a common cylindrical lens can once again be associated with all the light conducting rods whereby the constructional complexity can be significantly reduced without disadvantageously reducing the optical quality of the apparatus.
- the light gathering devices of the first and second rows can likewise be transversely spaced apart by an amount which preferably corresponds to their widths so that the mounting of the individual devices and their connection to the electronic processing circuit is possible in a straightforward manner.
- a laser light source 30 is arranged above a housing 13 parallel to the direction of scanning.
- the laser light source directs a sharply defined light beam 2 to a partially transmitting mirror or beam divider 21 which is also illustrated in Fig. 2.
- the beam divider 21 splits the light beam 2 into first and second light beams 2', 2" with intensities in the ratio 1 : 1.
- the second light beam 2" which is deflected at the surface of the beam divider 21 is once again deflected by a plane deflecting mirror 22 into the same direction as the first light beam 2' which is transmitted by the beam divider 21.
- the plane mirror 22 is so arranged that the first and second light beams 2', 2" converge slightly on one another so that they meet on the surface of a mirror wheel 23 after further deflection at a further plane deflecting mirror 31.
- the mirror wheel generates first and second slightly divergent scanning light beams 32, 33 which impinge parallel to the direction of the laser 30 on two strip-like plane mirrors 24', 25' which are spaced apart sideways from each other.
- the first and second light beams 2', 2" extend at right angles to the scanning direction of the apparatus between the deflecting mirror 31 and the mirror wheel 23.
- the strip-like plane mirrors 24', 25' reflect the incident scanning light beams 32, 33 to strip-like concave mirrors 24, 25.
- the optical arrangement is such that the mirror wheel sits at the focal point of these two concave mirrors.
- first and second scanning light beams 34, 35 emerge from the two concave mirrors 24, 25 with these light beams executing a parallel scanning movement in which they are continuously displaced parallel to themselves through the image spaces of their respective concave mirrors.
- These scanning light beams fall on respective first and second rows of strip-like dividing mirrors which are inclined at 45 0 to the incident scanning light beams.
- the dividing mirrors 9 and 10 are arranged one behind the other in first and second rows in an alternating sequence with the end regions of adjacent dividing mirrors of the sequence overlapping in the direction of the rows.
- the scanning light beam 34 passes through all the mirrors 9 of the first row whereas the scanning light beam 35 passes through all the dividing mirrors of the second row 10.
- the reflectivity of the dividing mirrors of each of the rows progressively increases in accordance with a simple mathematical progression along the row so that the same fraction of the light beam is reflected into the light curtain region by each successive dividing mirror of the row.
- the last mirror of each row can be a fully reflecting mirror instead of a dividing mirror.
- the inclined dividing mirrors thus reflect the incident scanning light beams through substantially 90° and form a series of overlapping light curtains which can be used to scan-across the full width of a web.
- the downwardly deflected scanning light beams 34, 35 impinge on a cylindrical lens 18 which extends over the whole length of the first and second rows of inclined mirrors.
- the cylindrical lens 18 projects the scanning light beams which form the light curtain to two adjacent positions 26, 26' on the surface of a material web 17 which is under investigation.
- This material web is tensioned over the surface of a drum 19 which is rotatable about an axis 20 which extends parallel to the first and second rows of inclined mirrors 9, 10 and lies in the central plane of symmetry 36 of the apparatus.
- the scanning positions 26, 26' are spaced from the cylindrical lens 18 by a distance equivalent to its focal length.
- the inclined mirror strips 9, 10 are transversely spaced apart from each other in the first and second rows by a distance A which is approximately twice as large as their widths.
- the cylindrical lens 18 symmetrically straddles the vertical central plane 36 between the two rows of inclined mirror strips 9, 10.
- the cylindrical lens extends on both sides significantly beyond the scanning light beams of the light curtain so that the outer regions of the cylindrical 'lens can be used for the reception of light reflected or remitted from the surface of the web 17.
- Fresnel lenses which are displaced in their longitudinal directions are arranged in two rows above the outer regions of the cylindrical lens 18. These Fresnel lenses cooperate with the cylindrical lens 18 and further cylindrical lenses 37 to concentrate the received light on photoelectric detectors 7 which are associated one with each of the Fresnel lenses.
- a single photoelectric detector or converter 7 and a single cylindrical lens 37 are shown on one side of the central plane of symmetry 36.
- a similar multiple arrangement of photoconductors 7 and cylindrical lenses 37 displaced in the longitudinal direction of the rows of Fresnel lenses will be understood to be present on the other side of the central plane of symmetry 36.
- the radius r of the drum 19 is so chosen that the light beams falling onto the surface of the web 17 at the points 26, 26' pass through the outer regions of the cylindrical lens 18 and are deflected into the Fresnel lenses 5, 6 when specular reflection occurs at the surface of the web 17.
- This arrangement is thus particularly suitable for investigating metal surfaces to detect the presence of surface defects.
- the compact nature of the arrangement can be readily appreciated by having regard to Fig. 4 from which it can be seen that the first and second rows of Fresnel lenses and the associated photoelectric detectors 7 can be arranged closely alongside the first and second rows of dividing mirrors 9, 10. To achieve a compact arrangement it is merely necessary to pay careful attention to the optical geometry of the apparatus.
- Fig. 5 shows an analogous arrangement in which the Fresnel lenses are replaced by small light conducting rods 5', 6' with the light conducting rods being displaced in the longitudinal direction and arranged in first and second rows in an alternating sequence.
- This alternating sequence can be best seen by reference to Fig. 6.
- the arrangement is here however used not to determine faults in the surface of a web which manifest themselves by reflection but rather to detect holes in the surface of the web which manifest themselves in transmission.
- the light receiving device is arranged on the opposite side of the web from the light transmitting device. As seen in Figs.
- cylindrical lenses 28, 28', 29, 29' are provided both in front of the material web and behind the material web with these cylindrical lenses extending over the full lengths of the respectively associated first and second rows of light conducting rods and strip-like dividing mirrors.
- the cylindrical lens 28 concentrates the light curtain from the row of inclined mirrors 10 onto the surface of the web 17 and light passing through holes in the web falls on the second cylindrical lens 29 which then concentrates this light in the interior of the light conducting rods 6'.
- the second pair of cylindrical lenses 28', 29' function in the same manner.
- the light conducting rods each have a stepped mirror arrangement 39 arranged along their surface facing the light entry surface.
- the individual mirrors of the stepped mirror arrangement serve to direct all incident light at angles of total reflection into the interior of the rod so that this light reaches a photoelectric detector 7 arranged at at least one end face of the light conducting rod. As seen in Fig. 6 all the photoelectric converters 7 are connected to a common electronic processing circuit 8.
- all the light conducting rods 5', 6' lying within one row are simultaneously able to receive light from the light curtain.
- the different signalsreceived from the individual light conducting rods can be evaluated in the electronic processing circuit 8 and can be used to provide an indication of the location of the fault in the web.
- the present embodiment uses five light conducting rods spaced apart across the web so that five different detectors are connected to the electronic processing circuit.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Textile Engineering (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3000352 | 1980-01-07 | ||
DE3000352A DE3000352C2 (de) | 1980-01-07 | 1980-01-07 | Optoelektronisches Überwachungsgerät |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0032117A2 true EP0032117A2 (fr) | 1981-07-15 |
EP0032117A3 EP0032117A3 (en) | 1982-05-12 |
EP0032117B1 EP0032117B1 (fr) | 1985-05-02 |
Family
ID=6091616
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81100044A Expired EP0032117B1 (fr) | 1980-01-07 | 1981-01-07 | Appareil de détection de trous ou défauts sur des surfaces |
Country Status (3)
Country | Link |
---|---|
US (1) | US4431309A (fr) |
EP (1) | EP0032117B1 (fr) |
DE (1) | DE3000352C2 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2255650A (en) * | 1991-05-08 | 1992-11-11 | Spectra Physics Scanning Syst | Laser bar code scanner producing parallel scan lines |
CN108489386A (zh) * | 2018-03-23 | 2018-09-04 | 福建农林大学 | 一种基于光电幕墙的毛边锯材形状位姿识别方法 |
CN111750777A (zh) * | 2020-06-22 | 2020-10-09 | 华中农业大学 | 自走式作物表型高通量检测装置 |
CN112666168A (zh) * | 2020-12-29 | 2021-04-16 | 尚越光电科技股份有限公司 | 一种cigs电池片不锈钢基底卷对卷表面快速检测系统 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3125189C2 (de) * | 1981-06-26 | 1984-06-14 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Fehlersuchgerät für breite Bahnen |
US4570074A (en) * | 1982-09-29 | 1986-02-11 | Q-Val Incorporated | Flying spot scanner system |
DE3635271C1 (de) * | 1986-10-16 | 1987-10-29 | Sick Optik Elektronik Erwin | Lichtvorhangsvorrichtung |
DE3806385A1 (de) * | 1988-02-29 | 1989-09-07 | Feldmuehle Ag | Verfahren und vorrichtung zum pruefen von transparenten bahnen |
US5068523A (en) * | 1990-03-02 | 1991-11-26 | Intec Corp. | Scanner detector array and light diffuser |
US5404008A (en) * | 1993-07-16 | 1995-04-04 | Rockwell International Corporation | Control system for detecting intrusion of a light curtain |
US5861078A (en) * | 1993-08-12 | 1999-01-19 | Cmd Corporation | Method and apparatus for detecting a seal on a plastic bag |
US5488480A (en) * | 1994-02-16 | 1996-01-30 | Cmd Corporation | Apparatus and method for detecting a heat seal in a moving plastic film |
US5539198A (en) * | 1993-09-28 | 1996-07-23 | Rockwell International Corporation | Uniform sensitivity light curtain |
US5985187A (en) | 1997-09-10 | 1999-11-16 | Southpac Trust International, Inc. | Apparatus and method for forming an article |
US6354716B1 (en) | 2000-08-04 | 2002-03-12 | Honeywell International Inc | Light curtain device |
KR102048361B1 (ko) * | 2013-02-28 | 2019-11-25 | 엘지전자 주식회사 | 거리 검출 장치, 및 이를 구비하는 영상처리장치 |
DE102014011268A1 (de) * | 2014-07-29 | 2016-02-04 | Brückner Maschinenbau GmbH & Co. KG | Optische Fehlstellendetektion |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE6601847U (de) * | 1963-10-04 | 1969-04-10 | Erwin Sick | Photoelektrische abtastvorrichtung fuer durchlaufende materialbahnen |
DE2255788A1 (de) * | 1972-11-15 | 1974-05-16 | Peter Hans | Schutz von objekten (anlagen und gelaende) gegen unbefugtes eindringen mittels laser-verfahren |
US3821557A (en) * | 1972-03-10 | 1974-06-28 | P Lipke | Device for checking movable webs of paper synthetic material metal foils and the like |
US3931525A (en) * | 1972-09-21 | 1976-01-06 | Ferranti, Limited | Detection of blemishes in surfaces |
DE2532602A1 (de) * | 1975-07-21 | 1977-01-27 | Sick Optik Elektronik Erwin | Optische vorrichtung zur verbreiterung eines lichtvorhanges |
US4013367A (en) * | 1974-05-13 | 1977-03-22 | Tokyo Shibaura Electric Co., Ltd. | Apparatus for detecting irregularities in the surfaces of materials |
DE2532603B2 (de) * | 1975-07-21 | 1978-04-13 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Optische Vorrichtung zur Bestimmung des Lichtaustrittswinkels |
DE2808359B2 (de) * | 1978-02-27 | 1979-12-20 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Suchgerät für Löcher in Bahnen |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD54409A (fr) * | ||||
US2547623A (en) * | 1948-12-27 | 1951-04-03 | Gen Electric | Spot detector recorder |
US3760184A (en) * | 1972-03-10 | 1973-09-18 | Sick Erwin Fa | Photoelectric monitoring device for pluralities of threads |
DE2433683C3 (de) * | 1974-07-12 | 1979-02-22 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Vorrichtung zur Überwachung einer Materialbahn auf Fehlstellen |
DE2508366C3 (de) * | 1975-02-26 | 1979-05-17 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Optische Vorrichtung mit einem Lichtvorhang |
JPS5849819B2 (ja) * | 1975-03-18 | 1983-11-07 | コニカ株式会社 | ソウサシキケンサソウチ |
US4040745A (en) * | 1975-06-30 | 1977-08-09 | International Business Machines Corporation | Inspection tool |
DE2550815C3 (de) * | 1975-11-12 | 1979-05-31 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Optisches Abtastsystem |
CH608628A5 (fr) * | 1975-11-21 | 1979-01-15 | Sick Optik Elektronik Erwin | |
DE2602970C3 (de) * | 1976-01-27 | 1979-02-08 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Vorrichtung zur Überwachung einer Materialbahn auf Fehlstellen |
US4038554A (en) * | 1976-03-09 | 1977-07-26 | Columbia Research Corporation | Detection of flaws in a moving web of transparent material |
CH600301A5 (fr) * | 1976-05-28 | 1978-06-15 | Bbc Brown Boveri & Cie | |
DE2727926C3 (de) * | 1977-06-21 | 1980-11-13 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Vorrichtung zur Ermittlung von Fehlstellen auf der reflektierenden Oberfläche einer Bahn |
DE2808360C3 (de) * | 1978-02-27 | 1981-09-24 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Optische Vorrichtung zur Bestimmung des Lichtaustrittswinkels |
US4260899A (en) * | 1979-06-14 | 1981-04-07 | Intec Corporation | Wide web laser scanner flaw detection method and apparatus |
US4310250A (en) * | 1980-02-01 | 1982-01-12 | Erwin Sick Gmbh | Apparatus for monitoring for faults in translucent strip material |
-
1980
- 1980-01-07 DE DE3000352A patent/DE3000352C2/de not_active Expired
-
1981
- 1981-01-07 EP EP81100044A patent/EP0032117B1/fr not_active Expired
- 1981-01-07 US US06/223,067 patent/US4431309A/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE6601847U (de) * | 1963-10-04 | 1969-04-10 | Erwin Sick | Photoelektrische abtastvorrichtung fuer durchlaufende materialbahnen |
US3821557A (en) * | 1972-03-10 | 1974-06-28 | P Lipke | Device for checking movable webs of paper synthetic material metal foils and the like |
US3931525A (en) * | 1972-09-21 | 1976-01-06 | Ferranti, Limited | Detection of blemishes in surfaces |
DE2255788A1 (de) * | 1972-11-15 | 1974-05-16 | Peter Hans | Schutz von objekten (anlagen und gelaende) gegen unbefugtes eindringen mittels laser-verfahren |
US4013367A (en) * | 1974-05-13 | 1977-03-22 | Tokyo Shibaura Electric Co., Ltd. | Apparatus for detecting irregularities in the surfaces of materials |
DE2532602A1 (de) * | 1975-07-21 | 1977-01-27 | Sick Optik Elektronik Erwin | Optische vorrichtung zur verbreiterung eines lichtvorhanges |
DE2532603B2 (de) * | 1975-07-21 | 1978-04-13 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Optische Vorrichtung zur Bestimmung des Lichtaustrittswinkels |
DE2808359B2 (de) * | 1978-02-27 | 1979-12-20 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch | Suchgerät für Löcher in Bahnen |
Non-Patent Citations (1)
Title |
---|
LASER + ELEKTRO-OPTIK, No. 6, 1973 Stuttgart G. PINIOR "Oberfl{chenkontrolle mit Laser" pages 13 to 14 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2255650A (en) * | 1991-05-08 | 1992-11-11 | Spectra Physics Scanning Syst | Laser bar code scanner producing parallel scan lines |
CN108489386A (zh) * | 2018-03-23 | 2018-09-04 | 福建农林大学 | 一种基于光电幕墙的毛边锯材形状位姿识别方法 |
CN111750777A (zh) * | 2020-06-22 | 2020-10-09 | 华中农业大学 | 自走式作物表型高通量检测装置 |
CN112666168A (zh) * | 2020-12-29 | 2021-04-16 | 尚越光电科技股份有限公司 | 一种cigs电池片不锈钢基底卷对卷表面快速检测系统 |
CN112666168B (zh) * | 2020-12-29 | 2022-08-05 | 尚越光电科技股份有限公司 | 一种cigs电池片不锈钢基底卷对卷表面快速检测系统 |
Also Published As
Publication number | Publication date |
---|---|
DE3000352C2 (de) | 1986-07-24 |
EP0032117A3 (en) | 1982-05-12 |
DE3000352A1 (de) | 1981-09-24 |
EP0032117B1 (fr) | 1985-05-02 |
US4431309A (en) | 1984-02-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4431309A (en) | Monitoring apparatus | |
US4511803A (en) | Fault detection apparatus for material webs | |
US4402609A (en) | Light curtain apparatus | |
US4302105A (en) | Detection apparatus for finding holes in webs | |
US4127771A (en) | Optical apparatus | |
US4004152A (en) | Apparatus for monitoring a moving web of material for faults | |
US4559451A (en) | Apparatus for determining with high resolution the position of edges of a web | |
EP0099023B1 (fr) | Tête de mesure pour la mesure de réflexion | |
US4306813A (en) | Apparatus for determining faults in strip material | |
US4904877A (en) | Optical scanning apparatus for detecting faults in transparent material wherein the plane of incident light is arranged at the breuster angle to the normal to the surface | |
EP0182471B1 (fr) | Appareil d'inspection utilisant un balayage par un faisceau de rayonnement | |
US4085322A (en) | Optical apparatus | |
US4500208A (en) | Apparatus for seeking faults in wide material webs | |
US4116527A (en) | Device for concentrating light from a linear field on to a receiver | |
US4227091A (en) | Optical monitoring apparatus | |
US4295743A (en) | Apparatus for determining faults in strip material | |
US4108533A (en) | Apparatus for combining light emanating from a linear scanning field | |
DE3737632C2 (fr) | ||
DE19511990C2 (de) | Messvorrichtung zum Messen von Transversalgeschwindigkeit und Länge eines Messobjekts | |
EP0119618B1 (fr) | Appareil optique pour la mesure de la transmission | |
GB2054835A (en) | Scanning Apparatus for Flaw Detection | |
DE3408106A1 (de) | Optischer rauheits-scanner | |
US4070114A (en) | Detector optics for use in fabric inspection | |
JPH04110707A (ja) | 三次元形状計測装置 | |
GB2129932A (en) | Position and/or dimensions of objects |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19810107 |
|
AK | Designated contracting states |
Designated state(s): FR GB IT |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): FR GB IT |
|
ITF | It: translation for a ep patent filed |
Owner name: BARZANO' E ZANARDO MILANO S.P.A. |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): FR GB IT |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19890107 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19890117 Year of fee payment: 9 |
|
ITTA | It: last paid annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19900107 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19900928 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |